@inproceedings{9954, abstract = {{To increase quality and reliability of copper wire bonds, self-optimization is a promising technique. For the implementation of self-optimization for ultrasonic heavy copper wire bonding machines, a model of stick-slip motion between tool and wire and between wire and substrate during the bonding process is essential. Investigations confirm that both of these contacts do indeed show stick-slip movement in each period oscillation. In a first step, this paper shows the importance of modeling the stick-slip effect by determining, monitoring and analyzing amplitudes and phase angles of tool tip, wire and substrate experimentally during bonding via laser measurements. In a second step, the paper presents a dynamic model which has been parameterized using an iterative numerical parameter identification method. This model includes Archard's wear approach in order to compute the lost volume of tool tip due to wear over the entire process time. A validation of the model by comparing measured and calculated amplitudes of tool tip and wire reveals high model quality. Then it is then possible to calculate the lifetime of the tool for different process parameters, i.e. values of normal force and ultrasonic voltage.}}, author = {{Unger, Andreas and Sextro, Walter and Meyer, Tobias and Eichwald, Paul and Althoff, Simon and Eacock, Florian and Brökelmann, Michael}}, booktitle = {{2015 17th Electronics Packaging Technology Conference}}, title = {{{Modeling of the Stick-Slip Effect in Heavy Copper Wire Bonding to Determine and Reduce Tool Wear}}}, doi = {{10.1109/EPTC.2015.7412375}}, year = {{2015}}, } @article{15964, author = {{Leuders, Stefan and Vollmer, Malte and Brenne, Florian and Tröster, Thomas and Niendorf, Thomas}}, issn = {{1073-5623}}, journal = {{Metallurgical and Materials Transactions A}}, pages = {{3816--3823}}, title = {{{Fatigue Strength Prediction for Titanium Alloy TiAl6V4 Manufactured by Selective Laser Melting}}}, doi = {{10.1007/s11661-015-2864-x}}, year = {{2015}}, } @inproceedings{16132, author = {{Weiß Borkowski, Nathalie and Marten, Thorsten and Block, Holger and Tröster, Thomas}}, location = {{Toronto, Canada}}, title = {{{Multi-axial Material Testing at High Strain Rates in High Speed Cupping Tests}}}, year = {{2015}}, } @inproceedings{16135, author = {{Frantz, M. and Lauter, C. and Wang, Z. and Tröster, Thomas}}, location = {{Bad Neuenahr}}, pages = {{139--144}}, publisher = {{Verlag Stahleisen GmbH}}, title = {{{Bestimmung und Optimierung von Eigenspannungen in hybriden Werkstoffsystemen aus Metall und Faserverbundkunststoff (FVK)}}}, year = {{2015}}, } @inproceedings{16136, author = {{Reuter, C. and Tröster, Thomas and Lauter, C.}}, location = {{Tagung Werkstoffprüfung 2015, Bad Neuenahr}}, pages = {{127--132}}, publisher = {{Verlag Stahleisen GmbH}}, title = {{{Kennwertermittlung an Faserverbundkunststoffen für Crashsimulationen mit dem FE-Solver LS-Dyna}}}, year = {{2015}}, } @inproceedings{16258, author = {{Reschetnik, W. and Leuders, S. and Riemer, A. and Tröster, Thomas and Richard, H. A. and Niendorf, T.}}, location = {{Orlando, Florida, USA}}, title = {{{Fatigue life prediction for metals processed by Selective Laser Melting using finite element analyses}}}, year = {{2015}}, } @inproceedings{16259, author = {{Wang, Z. and Lauter, C. and Sanitther, B. and Frantz, M. and Tröster, Thomas}}, location = {{Lisbon, Portugal}}, title = {{{Intrinsic Manufacturing of Metal-FRP-Hybrid Structural Automotive Components by Resin Transfer Moulding}}}, year = {{2015}}, } @inproceedings{16260, author = {{Lauter, C. and Wang, Z. and Tröster, Thomas and Brandis, R. and Köchling, D.}}, location = {{Lisbon, Portugal}}, title = {{{Methodology for the Product Engineering of Lightweight Structures in Multi-Material Design}}}, year = {{2015}}, } @inproceedings{16261, author = {{Leuders, S. and Meiners, S. and Taube, A. and Tröster, Thomas and Niendorf, T.}}, location = {{San Diego, USA}}, title = {{{Fatigue Behaviour of a Structural Component Manufactured by Selective Laser Melting and Investment Casting}}}, year = {{2015}}, } @inproceedings{16263, author = {{Wingenbach, Nils and Tröster, Thomas}}, location = {{Stuttgart}}, title = {{{Material follows form follows function}}}, year = {{2015}}, } @article{13165, author = {{Sonnenrein, G. and Baumhögger, Elmar and Elsner, A. and Fieback, K. and Morbach, A. and Paul, A. and Vrabec, J.}}, issn = {{0140-7007}}, journal = {{International Journal of Refrigeration}}, pages = {{166--173}}, title = {{{Copolymer-bound phase change materials for household refrigerating appliances: experimental investigation of power consumption, temperature distribution and demand side management potential}}}, doi = {{10.1016/j.ijrefrig.2015.06.030}}, year = {{2015}}, } @article{13166, author = {{Dubberke, Frithjof H. and Baumhögger, Elmar and Vrabec, Jadran}}, issn = {{0034-6748}}, journal = {{Review of Scientific Instruments}}, title = {{{Burst design and signal processing for the speed of sound measurement of fluids with the pulse-echo technique}}}, doi = {{10.1063/1.4921478}}, year = {{2015}}, } @article{34441, abstract = {{The state of the art industrial manufacturing process to produce shafts as counter surfaces for radial shaft seal rings is plunge grinding. This process consists of three major steps. The blank is turned to a slight diameter-oversize followed by the heat treatment and the hard-finishing by plunge grinding. The geometric surface structures of the resulting shafts in general exhibit a stochastic distribution. These surface characteristics contribute to a reliable and stable sealing functionality. And the surface and subsurface hardness generally leads to a higher wear resistance of the shaft. Motivated by economic benefits and in order to achieve a compact production process for at least ten years, turning is investigated as an alternative manufacturing process. However due to the resulting lead structure on the shaft surface and the associated risk of leakage it has not become prevalent yet. In this paper turned shafts of the metastable austenitic steel AISI 347 (1.4550, X6CrNiNb1810) are investigated as alternative material for counter surfaces of radial shaft seal rings and compared to turned shafts of carburized AISI 5115 (1.7131, 16MnCr5). In addition to surfaces dry turned at room-temperature, cryogenic turned AISI 347 counter surfaces are analyzed. By applying cryogenic cooling, the formation of deformation-induced α′-martensite in the surface layer is possible during the turning process. Endurance tests in radial shaft seal ring test rigs are performed and complemented with detailed investigations of microstructure, micro-hardness and surface topography. The results are compared to results of state of the art ground AISI 5115 shafts.}}, author = {{Frölich, D. and Magyar, Balázs and Sauer, B. and Mayer, P. and Kirsch, B. and Aurich, J.C. and Skorupski, R. and Smaga, M. and Beck, T. and Eifler, D.}}, issn = {{0043-1648}}, journal = {{Wear}}, keywords = {{Radial shaft seal ring, Shaft surface, Cryogenic turning, Metastable austenitic steel, Deformation-induced martensite formation}}, pages = {{123--131}}, title = {{{Investigation of wear resistance of dry and cryogenic turned metastable austenitic steel shafts and dry turned and ground carburized steel shafts in the radial shaft seal ring system}}}, doi = {{https://doi.org/10.1016/j.wear.2015.02.004}}, volume = {{328-329}}, year = {{2015}}, } @inproceedings{35234, author = {{Oehler, M and Magyar, Balázs and Sauer, B}}, booktitle = {{VDI-Berichte 2255}}, isbn = {{978-3-18-092255-3}}, pages = {{937--948}}, publisher = {{VDI Verlag GmbH}}, title = {{{Worm Gear Drives with High Efficiency}}}, year = {{2015}}, } @article{35235, author = {{Magyar, Balázs and Sauer, B}}, issn = {{2331-2483}}, journal = {{Power Transmission Engineering}}, number = {{4}}, pages = {{52--56}}, title = {{{Calculation of the efficiency of worm gear drives}}}, volume = {{9}}, year = {{2015}}, } @misc{22491, author = {{Zimmer, Detmar and Nolte, Karsten and Hütte, Jürgen}}, title = {{{Wellendichtsysteme}}}, year = {{2015}}, } @inproceedings{23650, author = {{Pottebaum, Jens and Lindemann, Christian-Friedrich and Deppe, Gereon and Koch, Rainer}}, booktitle = {{Aviation in Europe - Innovating for Growth, Proceedings of the Sventh European Aeronautics Days}}, pages = {{547--557}}, title = {{{Additive Manufacturing for Future Repair and Maintenance for the Aerospace Industry}}}, year = {{2015}}, } @phdthesis{23067, author = {{Shareef, Zeeshan}}, publisher = {{Verlagsschriftenreihe des Heinz Nixdorf Instituts, Paderborn}}, title = {{{Path Planning and Trajectory Optimization of Delta Parallel Robot}}}, volume = {{345}}, year = {{2015}}, } @article{24698, author = {{Cheng, C. and Mahnken, Rolf}}, issn = {{0927-0256}}, journal = {{Computational Materials Science}}, pages = {{144--158}}, title = {{{A multi-mechanism model for cutting simulations based on the concept of generalized stresses}}}, doi = {{10.1016/j.commatsci.2014.12.028}}, year = {{2015}}, } @article{24699, author = {{Leismann, T. and Mahnken, Rolf}}, issn = {{0020-7462}}, journal = {{International Journal of Non-Linear Mechanics}}, pages = {{115--127}}, title = {{{Comparison of hyperelastic micromorphic, micropolar and microstrain continua}}}, doi = {{10.1016/j.ijnonlinmec.2015.08.004}}, year = {{2015}}, }